// fs.c -- Defines the interface for and structures relating to the virtual file system.
//         Written for JamesM's kernel development tutorials.

#include "fs.h"

fs_node_t *fs_root = 0; // The root of the filesystem.

uint32_t read_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
	// Has the node got a read callback?
	if (node->read != 0)
		return node->read(node, offset, size, buffer);
	else
		return 0;
}

uint32_t write_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
	// Has the node got a write callback?
	if (node->write != 0)
		return node->write(node, offset, size, buffer);
	else
		return 0;
}

void open_fs(fs_node_t *node, uint8_t read, uint8_t write) {
	// Has the node got an open callback?
	if (node->open != 0)
		return node->open(node);
}

void close_fs(fs_node_t *node) {
	// Has the node got a close callback?
	if (node->close != 0)
		return node->close(node);
}

dirent_t *readdir_fs(fs_node_t *node, uint32_t index) {
	// Is the node a directory, and does it have a callback?
	if ((node->flags & 0x7) == FS_DIRECTORY && node->readdir != 0)
		return node->readdir(node, index);
	else
		return 0;
}

fs_node_t *finddir_fs(fs_node_t *node, char *name) {
	// Is the node a directory, and does it have a callback?
	if ((node->flags & 0x7) == FS_DIRECTORY && node->finddir != 0)
		return node->finddir(node, name);
	else
		return 0;
}
